Kill THTensor_(bhistc). (#31254)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31254
It's not used.
Test Plan: Imported from OSS
Differential Revision: D19022923
Pulled By: gchanan
fbshipit-source-id: caa5e6b7a133f24f8f3349fd1e53147f8dd3fd97
